There is a lack of persistent forage legumes for permanent pastures in eastern Canada. Kura clover (Trifolium ambiguum M. Bieb.; KC) is a long‐lived species, with demonstrated potential in various regions, however, there is a lack of information on its performance in mixtures with grasses and no comparisons with white clover (Trifolium repens L.; WC), the main legume species recommended for pastures in eastern Canada. Objectives were to evaluate the potential of KC when grown in mixtures with grasses and compare its performance with WC based‐mixtures and N‐fertilized grass monocultures. Twenty treatments that included KC, WC, and six perennial grasses species (Kentucky bluegrass [Poa pratensis L.; KB], meadow bromegrass [Bromus biebersteinii Roem. & Schult., MB], orchardgrass [Dactylis glomerata L., OR], smooth bromegrass [Bromus inermis L.; SB], tall fescue [Schedonorus arundinaceus (Schreb.) Dumort.; TF], and timothy [Phleum pratense L.; TI]) seeded alone and in binary mixtures were seeded in 2 yr at two sites and monitored for up to four production years. During the first production year, WC‐based mixtures yields were overall greater than those of KC‐based mixtures, while in the second production year and onwards, KC treatments had similar or greater yields than WC, illustrating the greater persistence of KC. Adding KC to grasses also increased total forage yields by 13% on average compared to N‐fertilized solo‐seeded grasses. The performance of specific KC–grass mixtures was variable across sites‐years with no specific mixture being consistently more productive. Kura clover is adapted to contrasting environments of Québec and appears to be a suitable alternative to WC.

中文翻译：

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库拉三叶草和白三叶草与草的混合物的生产力和持久性

加拿大东部缺乏用于永久牧场的持久性牧草。库拉三叶草（Trifolium ambiguum M.Bieb .; KC）是一种长寿物种，在各个地区都有潜力，但是缺乏与草混合物的性能信息，也无法与白三叶草（Trifolium repens）进行比较。L .; WC），推荐用于加拿大东部牧场的主要豆类种类。目的是评估在与草的混合物中生长时KC的潜力，并将其与WC基混合物和氮肥草单一培养物的性能进行比较。二十种处理方法包括KC，WC和六种多年生草种（肯塔基州蓝草[ Poa pratensis L.； KB]，草地无芒草[ Bromus biebersteiniiem ＆Schult。，MB]，果园[ Dactylis glomerata L.，OR]，光滑的无花果草[ Bromus inermis L .; SB]，高羊茅[ Schedonorus arundinaceus（Schreb。）Dumort。TF]和timothy [ Phleum pratenseL .; TI]]单独播种并以二元混合物播种，并在2年内在两个地点播种，并监测长达四个生产年。在第一个生产年中，基于WC的混合物的产量总体上高于KC混合物，而在第二个生产年及以后，KC处理的产量与WC相似或更高，这说明了KC的持久性更高。与施用N肥的单播草相比，向草中添加KC还平均使总草料产量提高了13％。特定的KC-草混合物的性能在不同站点-年份之间是可变的，没有特定的混合物可以持续提高生产率。库拉三叶草适合魁北克的对比环境，似乎是WC的合适替代品。